Speed up dotnet format lint hook from ~85s to ~13s

[Mpdreamz]

Why

The pre-push git hook calls `./build.sh lint `, which runs `dotnet format --verify-no-changes` on the full solution. This takes ~85s because Roslyn loads all 40+ projects and runs three formatters sequentially — `style` and `analyzers` together add ~60s of semantic analysis overhead that isn't needed locally.

What

The `lint` build target now differentiates based on whether files are provided:

• With files (pre-push hook): runs `dotnet format whitespace --verify-no-changes --no-restore --include ` (~13s). Enforces all `.editorconfig` spacing/indentation rules; style and analyzer violations aren't accidentally introduced during normal coding.
• No files (CI): runs `dotnet format --verify-no-changes --no-restore` (~52s). Full check — whitespace + style + analyzers — but skips restore since packages are already available, saving ~30s vs before.

CI's lint step continues to call `dotnet run --project build -c release -- lint` (no files), so it still runs the thorough check.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 289ac4ed-9c9a-4dc6-aec3-820f1ce96dae

📥 Commits

Reviewing files that changed from the base of the PR and between b38a552 and ee8ce34.

📒 Files selected for processing (1)

• build/Targets.fs

✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch perf/faster-dotnet-format-lint

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